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Anaerobic co-digestion of chicken manure and corn stover in batch and continuously stirred tank reactor (CSTR)
- Li, Yeqing, Zhang, Ruihong, He, Yanfeng, Zhang, Chenyu, Liu, Xiaoying, Chen, Chang, Liu, Guangqing
- Bioresource technology 2014 v.156 pp. 342-347
- anaerobic digestion, biogas, carbon nitrogen ratio, corn stover, energy, methane, poultry manure, pyrolysis, total solids
- Anaerobic co-digestion of chicken manure and corn stover in batch and CSTR were investigated. The batch co-digestion tests were performed at an initial volatile solid (VS) concentration of 3gVS/L, carbon-to-nitrogen (C/N) ratio of 20, and retention time of 30d. The methane yield was determined to be 281±12mL/gVSadded. Continuous reactor was carried out with feeding concentration of 12% total solids and C/N ratio of 20 at organic loading rates (OLRs) of 1–4gVS/L/d. Results showed that at OLR of 4gVS/L/d, stable and preferable methane yield of 223±7mL/gVSadded was found, which was equal to energy yield (EY) of 8.0±0.3MJ/kgVSadded. Post-digestion of digestate gave extra EY of 1.5–2.6MJ/kgVSadded. Pyrolysis of digestate provided additional EY of 6.1MJ/kgVSadded. Pyrolysis can be a promising technique to reduce biogas residues and to produce valuable gas products simultaneously.